Hi, I can help with the first one, at least.
The camera, as you describe it, is set up for Back Button Focus - which is my preferred method for getting focus with a camera. If you have no experience with it, I would recommend watching the following video and considering if it would be worthwhile trying.
So, to make it work, two settings have been changed from the default and you can use the instructions in the video to find the correct option screens. Referring to the video, you will see that the shutter button has been set to exposure only, whereas the default is focus
and exposure. So, if you
really want to change it back that is the one you should choose. The second function is likely that focus is AI Servo, which will track focus on a subject as long as the focusing function is activated (by shutter button or AF-ON). Finally, the focusing area may be set to single point, centre and you can use the focus select button to change that. This is all listed in the manual, which you may not have but can download from:
eos60d-im3-c-en.pdf (c-wss.com).
I would recommend that when getting a second-hand camera you do a full factory reset, so that everything is set to the default values. You may also have to check the copyright settings if they have been configured.
As regards the lens. The camera should recognize EF and EF-S lenses. It is possible that a factory reset may help with that, but if not then it would help us to know the exact specs of the lens you are trying to attach.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
